Automatic lathe



Jan.21,1936." K, TE KY 2,028,362

' AUTOMATIC LATHE Figled Nov. 29, 1.953 2 I .12

Jn en for .lf'arljsafix Patented JamZl, 1936 ionNovembc M "Applicat 29,1933, SerialNo. 700,281 In GermanyDecemher 10,1932. e I.

4 Claims. (01. as-53)" My invention relates to automatic lathes and more especially to the friction clutches forming clutches. This results in a corresponding produc- 15 tion of frictional heat, and finally in temperatures which areso elevated as to interfere with the operation of the machine; Thus, theoverheating of the clutches deteriorates the lubricant in the bearings of the friction cones, or in.other bearings in the vicinity, and causes heateexpansion and warping of parts of the lathe, particularly of its head stock, and bed, by local heating;

Such deformation is unfavorable with respect to the required accuracy of the parts. which are 25 tooled.

My invention provides meansrfor eliminating l these drawbacks in a simple and efficient man'- ner, and without introducing sources of troubles of other kind.

bodying my invention is illustrated diagrammatically by way of example.

In thedrawing 35 tornatic lathe and Fig. 2 is a similar view of a thread-cutting lathe, both provided with a friction clutch embodying 40 myinvention,

50 members 2, 2 and 3 isa double-armed lever which is fulcrumed on the'lathe bed. One end of the lever 3 engages in a groove of the twin friction cone, and the other end is operated by. a camming groove 5 in a cylinder on the control shaft 4. The

' 55 friction cone is reciprocated as the shaft 4 ro- I tates.

6 and I are female friction cones for cooperation with the cones or malemembers 2, 2. The cone 6 is connected to a pulley 8, and the cone 60 I is connected to a pulley 9. Both pulleys are In the drawing aflixed to this specification and forming part thereof, an automatic lathe e'm- Fig. 1 is a partly. sectional elevation of an 9.11-

l is the spindle of the lathe which is mounted to rotate freely on the spindle l butrotatein opposite directions.

According to myinvention, the two female cones G and I are equippedwith means, here shown as helical ribs III, for effecting a flow. of 5 the ambient air with'respect to the corresponding cone. The flowing air, as indicated'by the arrows in- Fig. 1, moves along the surface ofthe corresponding cone in parallel relation to its axis and, asthe helical ribs Ill on the individual cones 10 have opposite hands, the air flows towardthe inner ends of the two cones where it is deflected tangentially.

Preferably, a casing is provided which surrounds the helical ribs' I I! in spaced relation thereto, and is fixed. By these means the cooling action of the flowing air is intensified. The casing is preferably built up from two send-cylindrical shells I! and I 2, Fig. 3. The lower shell H is integralwith the lathe bed, and the upper shell I2 e is hinged to the lower shell at one side so as to form a lid which is adapted to be raised. Openings IS in the central zone of the upper shell I: permit the heated air to escape.

Referring now to Fig. 2, this thread-cutting 25. p

lathe, like the automatic lathe in Figs. 1 and 3, will not be-described in detail. 14 is its spindle on which the twin. friction cone with its two male members 2 is. mounted to be" displaced by the means described with reference to Fig. 1'. In this lathe, however, only thepulley 8 is provided and connected to the female cone 6, asdescribed with reference to Figs. land 3, the other female cone 1; with its pulley 9, being replaced by a fixed female cone, [5 which is "mounted in thelathe bed.

I6 are air passages or ducts in the fixedfemale cone. I5.

Only the rotary part or. female cone 6 is equipped with the means or ribs It, as described for both cones Gand I in Fig. 1, and the ribs have 40 a double function here, since they not only establish a flow of air along the cone 6 but also through the ducts l6 of the fixed cone, so that both. the rotary and the fixed female cone are cooled efliciently.

My invention has been illustrated for two types of lathes only with a view to demonstrating its adaptability. Obviously, the possibilities of my invention are not. exhausted by these two examples.

I wish it to be understood that Ido not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

1.]An automatic lathe comprising in combination," a lathe. bed, a lathe spindle revoluble on said bed anda pair of revoluble clutching parts surrounding said spindle and forming a friction clutch, a helical rib formed on one of said revoluble clutching parts being arranged to eiiect a flow of the ambient air with respect to said parts.

2. An automatic lathe comprising in combination,'a lathe bed, a lathe spindle revoluble on said bed and a pair of revoluble clutching parts surrounding said spindle and forming a friction clutch, a helical rib formed on one of said revoluble clutching parts being arranged to efiect a flow of the ambient air with respect to said parts and a stationary casing surrounding said ribbed part in spaced relation.

3. An automatic lathe comprising in combinatlon, a lathe bed, a lathe spindle revoluble on said 15 bed and a pair 01' revoluble clutching parts surrounding said spindle and forming a friction clutch, a helical rib formed on one of said revoluble clutching parts being arranged to effect a flow of the ambient air with respect to said parts, and an apertured stationary casing surrounding said ribbed part in spaced relation.

4. An automatic lathe comprising in combination, a lathe bed, a lathe spindle revoluble on said said spindle and forming a friction clutch, a helical rib formed on one of said revoluble clutching parts being arranged to efi'ect a flow of the ambient air with respect to said. stationary part.

KARL TESSKY. 

